A large South American bivalve, Leila blainvilliana is often confused with the widespread and common Anodontites trapesialis, to which it is externally similar. They can be easily separated if one has the shells in hand. A simple examination of the inside of the shell reveals the tell-tale pallial sinus associated with the "siphons," unique in the genus Leila. Don't worry if you have misidentified these in your collection  the holdings of some of the more illustrious institutions possess misidentified specimens, determined by "specialists" in their field.